<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/book_title"
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:gravity="center"
        android:visibility="gone"
        app:layout_constraintBottom_toTopOf="@+id/epub_navigator"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/epub_navigator"
        android:tag="@string/epub_navigator_tag"
        android:name="org.readium.r2.navigator.epub.EpubNavigatorFragment"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/book_title"
        />

</androidx.constraintlayout.widget.ConstraintLayout>